Classifications

• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
  • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
  • C01B39/14—Type A
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
  • C11D3/1246—Silicates, e.g. diatomaceous earth
  • C11D3/128—Aluminium silicates, e.g. zeolites
• • C—CHEMISTRY; METALLURGY
  • C01—INORGANIC CHEMISTRY
  • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
  • C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
  • C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
  • C01B39/20—Faujasite type, e.g. type X or Y
  • C01B39/22—Type X
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/04—Water-soluble compounds
  • C11D3/08—Silicates
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S423/00—Chemistry of inorganic compounds
  • Y10S423/21—Faujasite, e.g. X, Y, CZS-3, ECR-4, Z-14HS, VHP-R
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S423/00—Chemistry of inorganic compounds
  • Y10S423/24—LTA, e.g. A, alpha, ZK-4, ZK-21, ZK-22

Definitions

• This invention relates to a microporous crystalline material.
• zeolite A-LSX Low Silica X
• the invention further relates to the use of said material as a builder in detergent systems.
• the invention also relates to detergent compositions containing said zeolite A-LSX.
• Zeolites both of natural and synthetic origin, are alumino-silicates of porous crystalline nature formed from a three-dimensional framework of TO 4 tetrahedra, where T can be silicon or aluminium.
• T can be silicon or aluminium.
• the presence of aluminium in tetrahedral coordination in the crystalline lattice determines excess negative charge which is balanced by alkali metal ions (Na, K, Rb, Li or Cs), alkaline earth ions (Mg or Ca), or ammonium ions.
• zeolite A As a builder in detergent systems, such as described, for example, in U.S. Pat. No. 4,649,036, for removing from wash water the polyvalent metal ions, in particular calcium ions, which constitute most of the hardness in water.
• zeolite A does not appreciably reduce the hardness due to magnesium ion presence because of its insufficient pore size in relation to the radius of this ion in aqueous solution at initial contact temperature during washing with mains water.
• the magnesium ion exchange kinetics are very slow and consequently the capacity of zeolite A to remove magnesium ions is insufficient in practice, to the extent of requiring adjuvant additives.
• zeolite X Another zeolite known in detergency is zeolite X described, for example, in German patent DD 43,221, which has a pore opening sufficiently large to provide a sufficiently high ion exchange rate, in particular of the magnesium ion.
• Si/Al ratio which, in contrast to that of zeolite A, always well exceeds 1, results in a reduction in overall ion exchange capacity.
• zeolite LSX Low Silica X
• zeolite A-LSX Low Silica X
• Said zeolite is characterised by a structure representing the advantages both of zeolites of type A and of zeolites of type X.
• said zeolite is particularly suitable for use in the detergent field in that it provides a high capacity for and rate of removal of the calcium and magnesium ions present in water at normal wash temperature.
• the zeolite A-LSX of the present invention provides a calcium and magnesium ion exchange capacity and rate decidedly greater than those obtainable by simply physically mixing zeolite A with zeolite X. Furthermore, in the zeolite A-LSX of the present invention, a zeolite LSX percentage of the order of 20%-30% is sufficient to achieve the required performance objectives in terms of calcium and magnesium ions exchange capacity and rate. However, if necessary, the zeolite LSX percentage can reach 90%.
• the present invention therefore provides a microporous crystalline material named zeolite A-LSX having, in its anhydrous form, an oxides molar composition corresponding to formula (I):
• M and M' identical or different, represent a cation of an alkali or alkaline earth metal of valency n;
• z is a number between 2.1 and 2.6, extremes included.
• M and M' different from each other, represent an alkali metal, more preferably sodium and potassium respectively.
• the zeolite A-LSX of the present invention is obtained by a process comprising:
• SiO 2 /Al 2 O 3 from 2.30 to 2.60, extremes included, preferably from 2.40 to 2.55, extremes included;
• M 2/n O/(M 2/n O+M' 2/n O) from 0.91 to 1.00, extremes included, preferably from 0.94 to 0.96, extremes included;
• stage b) bringing the two mixtures prepared in stage a) into contact at a temperature of between 20° C. and 70° C. for a time of between 1 minute and 30 minutes;
• stage b) aging the mixture obtained in stage b) at a temperature of between 60° C. and 70° C. for a time of between 30 minutes and 15 hours, preferably between 2 hours and 8 hours;
• stage c) crystallizing the mixture obtained in stage c) at a temperature of between 90° C. and 100° C. for a time of between 10 minutes and 120 minutes, preferably between 30 minutes and 60 minutes.
• Stage a) of the aforedescribed process is conducted at a temperature of between 20° C. and 220° C.: the temperature used depending on the starting material.
• the source of the aluminium used in stage a) of the process of the present invention is a sodium aluminate solution or a sodium and potassium aluminate solution.
• the source of the silica used in stage a) of the process of the present invention is a sodium silicate solution or a sodium and potassium silicate solution, in which the SiO 2 /Na 2 O or SiO 2 /(Na 2 O +K 2 O) ratio is a whole or fractional number between 1 and 3, extremes included.
• the source of the cations used in stage a) of the process of the present invention is sodium hydroxide or a mixture of sodium and potassium hydroxides.
• M represents sodium and M' represents potassium, the reactants being mixed in stage b) at room temperature by adding together the aqueous solutions prepared in stage a) under agitation over a heel of water.
• the mass is left to stand, preferably without agitation. Even if mixture agitation is not a critical operative parameter, depending also on the synthesis apparatus, it is however preferable to conduct said aging stage c) under static conditions and the crystallization stage d) under static conditions or under agitation (agitation being conducted with the common devices known to the expert of the art).
• M represents sodium and M' represents potassium
• the reaction mixture of stage b) being formed by adding under agitation to the sodium aluminate solution or sodium and potassium aluminate solution prepared in stage a), the sodium silicate solution or sodium and potassium silicate solution prepared in stage a), at a temperature such as to obtain an average resultant temperature between 60° C. and 70° C., the subsequent stages c) and d) being conducted under the aforedescribed conditions.
• the solid crystalline product On termination of the crystallization stage d), the solid crystalline product is separated from the mother mixture by conventional methods such as filtration, washed with demineralized water and dried. This drying is conveniently conducted at a temperature of up to about 170° C. and preferably of the order of 90° C.-120° C., for a time sufficient to completely or substantially completely eliminate the imbibition water.
• the preferred final product has the following composition in terms of moles of oxide:
• SiO 2 from 2.10 to 2.30, extremes included; and a crystalline H 2 O content of between 21% and 24%, extremes included.
• the zeolite A-LSX of the present invention has an average particle diameter of between 0.9 ⁇ m and 10 ⁇ m, extremes included, preferably between 1.5 ⁇ m and 5 ⁇ m, extremes included.
• the present invention also relates to the use of said zeolite A-LSX as a builder in detergent systems.
• the present invention also relates to the detergent compositions containing the aforedescribed zeolite A-LSX.
• the zeolite A-LSX can be incorporated in detergent compositions of any physical form, such as powders, liquids, gels and solid bars.
• the zeolite A-LSX of the present invention can be used as a builder either alone or together with other commonly used builders. Said zeolite can replace zeolite A and zeolite LSX in the detergent compositions used for normal applications.
• Two classes of detergent compositions in which the zeolite of the present invention is particularly useful are fabric wash detergents and dishwasher detergents.
• the total builder quantity present in the detergent compositions is usually between 20 wt % and 80 wt %, which quantity can consist totally or partially of the zeolite A-LSX of the present invention. If desired, zeolite A-LSX can be used in combination with other aluminosilicates such as zeolite A.
• the quantity of zeolite A-LSX present in the detergent compositions of the present invention is preferably between 20 wt % and 50 wt %.
• polymer polycarboxylates such as polyacrylates, acrylic-maleic copolymers, acrylic phosphinates
• monomer polycarboxylates such as nitrotriacetates and ethylenediaminotetraacetates
• inorganic salts such as sodium carbonate; and many other commonly used compounds known to the expert of the art.
• the zeolite A-LSX of the present invention is useful, particularly, in detergent compositions which do not contain, or contain only a small quantity of, builders containing inorganic phosphate such as sodium tripolyphosphate, sodium orthophosphate or sodium pyrophosphate.
• the detergent compositions can also contain, as essential components, one or more surfactants, which can be chosen from anionic, cationic, nonionic, amphoteric or zwitterionic surfactants containing or not containing soap, or their mixtures.
• surfactants which can be chosen from anionic, cationic, nonionic, amphoteric or zwitterionic surfactants containing or not containing soap, or their mixtures.
• Many surfactants usable for the purpose are available commercially and are described in the literature, for example in "Surface-Active Agents and Detergents", Vol I and II, by Schwartz, Perry and Berch.
• Preferred surfactants are soap-containing anionic and nonionic surfactants, and synthetic anionic and nonionic surfactants not containing soap.
• Anionic surfactants are well known in the art. Examples of these are alkylbenzene sulphonates, in particular sodium alkylbenzene sulphonates having a C 8 -C 15 alkyl chain; primary and secondary alkyl sulphates, in particular sodium sulphates of a C 12 -C 15 primary alcohol; olefin sulphonates; alkane sulphonates; dialkyl sulphosuccinates; sulphonated fatty acid esters.
• alkylbenzene sulphonates in particular sodium alkylbenzene sulphonates having a C 8 -C 15 alkyl chain
• primary and secondary alkyl sulphates in particular sodium sulphates of a C 12 -C 15 primary alcohol
• olefin sulphonates alkane sulphonates
• dialkyl sulphosuccinates sulphonated fatty acid esters.
• Usable nonionic surfactants are ethoxylated primary and secondary alcohols, in particular ethoxylated C 11 -C 18 primary and secondary alcohols containing from 1 to 20 moles of ethylene oxide per mole of alcohol; and alkylpolyglucosides.
• surfactant and the quantity present depend on the final use of the detergent composition. For example, for dishwasher detergents it is preferable to use a small quantity of nonionic surfactant of low foaming capacity.
• nonionic surfactant of low foaming capacity.
• different surfactants can be used, as is well known to the expert of the art, depending on the final use of said detergent compositions, ie hand or machine washing.
• the total quantity of surfactant present in the detergent compositions obviously depends on their final use and can be low, such as 0.5 wt % in detergent compositions for example for dishwashers, or high, such as 60 wt % in detergent compositions for example for hand-washing fabrics. Generally, in the case of detergent compositions for fabric washing, a surfactant quantity of between 5% and 40% is used.
• a preferred type of detergent composition for machine-washing fabrics contains anionic surfactants and nonionic surfactants in a weight ratio of at least 0.67:1, preferably 1:1, and more preferably between 1:1 and 10:1.
• the detergent compositions of the present invention can also contain bleaching agents.
• Dishwasher detergent compositions can contain chlorine as bleaching agent
• fabric wash detergent compositions can contain peroxides as bleaching agents, such as, for example, inorganic persalts or organic peroxyacids, which can be used together with activators which improve the bleaching action at low wash temperature.
• peroxides as bleaching agents, such as, for example, inorganic persalts or organic peroxyacids, which can be used together with activators which improve the bleaching action at low wash temperature.
• detergent compositions of the present invention are sodium silicate, fluorescent agents, anti-redeposition agents, inorganic salts such as sodium sulphate, enzymes, foam control agents or foaming agents (according to the particular case), pigments and perfumes. This list is in no way exhaustive.
• the detergent compositions of the present invention can be prepared by the various methods known in the art.
• detergents in powder form can be prepared by spray-drying a slurry of heat-insensitive compatible components followed by spraying-on or after-dosing those ingredients which cannot be used in the slurry process.
• the expert of the art will have no difficulty in deciding which components can be included in the slurry and which must be after-dosed or sprayed-on.
• the zeolite A-LSX of the present invention can generally be included in the slurry, although other incorporation methods can obviously be used such as, for example, compounding the dry powders.
• Zeolite A-LSX of the present invention with small-dimension particles is particularly useful in liquid detergent compositions. Said compositions and methods for preparing them are well known to the expert of the art.
• a heel of demineralized water (1300 parts) is fed at room temperature (about 20° C.) into a steel reactor of 3 liters capacity, fitted with an agitator, thermometer and an oil circulation jacket connected to a temperature-controlled bath.
• the following solutions are fed in simultaneously under agitation over about 30 minutes:
• sodium silicate 700 parts of 13% SiO 2 and 6.5% Na 2 O, at a temperature of about 20° C.;
• sodium aluminate 1000 parts of 6.2% Al 2 O 3 and 16.3% Na 2 O, and containing 27.5 parts of K 2 O, at a temperature of about 20° C.
• a gel mass is obtained and is heated, under agitation, by circulating oil through the jacket at a temperature of 70° C. On reaching 70° C., agitation is halted and said temperature is maintained for 12 hours.
• the crystals are filtered off under vacuum, washed with demineralized water, dried in an oven at 100° C. for 4 hours, and left to stabilize in air.
• a zeolite A-LSX is obtained, the physical characteristics of which are reported in Table 1.
• a heel of demineralized water (400 parts) is fed at room temperature (about 20° C.) into a steel reactor of 2 liters capacity, fitted with an agitator, thermometer and an oil circulation jacket connected to a temperature-controlled bath.
• sodium silicate 500 parts of 26.7% SiO 2 and 13.35% Na 2 O, at a temperature of about 20° C.;
• sodium aluminate (1100 parts) of 8.9% Al 2 O 3 and 13.7% Na 2 O, and containing 14.1 parts of K 2 O, at a temperature of about 20° C.
• a gel mass is obtained and is heated, under agitation, by circulating oil through the jacket at a temperature of 70° C. On reaching 70° C., agitation is halted and said temperature is maintained for 6 hours.
• the crystals are filtered off under vacuum, washed with demineralized water, dried in an oven at 100° C. for 4 hours, and left to stabilize in air.
• a zeolite A-LSX is obtained, the physical characteristics of which are reported in Table 1.
• sodium aluminate (1525 parts) of 6.0% Al 2 O 3 and 6.72% Na 2 O, and containing 14.15 parts of K 2 O, at a temperature of about 65° C.
• sodium silicate (475 parts) of 28.4% SiO 2 and 14.2% Na 2 O, at a temperature of about 65° C.
• a gel mass is obtained and is maintained at 65° C. under agitation for 30 minutes. The agitation is halted and the mass left standing at 65° C.-67° C. for 12 hours.
• the crystals are filtered off under vacuum, washed with demineralized water, dried in an oven at 100° C. for 4 hours, and left to stabilize in air.
• a zeolite A-LSX is obtained, the physical characteristics of which are reported in Table 1.
• sodium aluminate (1512 parts) of 6.8% Al 2 O 3 and 7.94% Na 2 O, and containing 15.1 parts of K 2 O, at a temperature of about 65° C.
• sodium silicate (488 parts) of 28.4% SiO 2 and 14.2% Na 2 O, at a temperature of about 65° C.
• a gel mass is obtained and is maintained at 65° C. under agitation for 30 minutes. The agitation is halted and the mass left standing at 65° C.-67° C. for 5 hours.
• the crystals are filtered off under vacuum, washed with demineralized water, dried in an oven at 100° C. for 4 hours, and left to stabilize in air.
• a zeolite A-LSX is obtained, the physical characteristics of which are reported in Table 1.
• the calcium ion exchange rate and capacity were measured using an apparatus with a specific ion electrode in a standard system.
• Example 5 Using the apparatus described in Example 5 and operating under the same conditions, the calcium ion exchange kinetics are measured in the same aqueous system with sodium chloride added to achieve a concentration thereof of 0.01 moles/l.
• Example 5 Using the apparatus described in Example 5 modified for the use of an electrode specific for the magnesium ion and operating under the same conditions, the magnesium ion exchange kinetics are measured in the same aqueous system.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
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• General Life Sciences & Earth Sciences (AREA)
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• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Materials Engineering (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Silicates, Zeolites, And Molecular Sieves (AREA)
• Detergent Compositions (AREA)

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• 1996
  • 1996-06-27 IT IT96MI001311A patent/IT1284078B1/it active IP Right Grant
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